International armed conflicts are a reality of humanity - a phenomenon that largely determined the development. The time immediately after the Second World War was marked by the adoption of the four Geneva Conventions of 1949, which all contain certainly the most important provision in the field of International Armed Conflicts - Article 3 common to all of them. In the sixties and seventies of the last century all the more powerful, the idea of the need for revision of the Geneva Conventions. Thus, almost thirty years later, at the Diplomatic Conference held in Geneva from 1974th to 1977th year, adopted a document that is entirely composed of non-international conflicts - Additional Protocol II on the Protection of Victims of International Armed Conflicts. The legal rules of war were being developed through the centuries as the unwritten rules of common law. According to the traditional laws of war, it introduced a state of war or a formal declaration of war or actual commencement of hostilities led into an intention of war. Therefore, determining the existence of a state of war greatly depended on subjective factors - whether at war or declare war there is the intention of war. The rules of international law restrict the implementation of the very act of war armed struggle to a certain circle of people. Only those persons must lead the fight with weapons, but only against the same circle of people opposing party. The circuit consists of the armed forces, which comprise primarily members of the Army, Navy and various aviation. Name neutrality stands for two. On the one hand, the neutrality of the state of a country which does not participate in the war between the union two or more other countries. On the other hand, the neutrality of the relationship between the warring states and neutralnh state, which is based on the fact that the first is in a state of war, and others do not participate in the war on either side. Where there is no war, there is no neutrality, and vice versa.